[harryrcb]

I can't tell you how it compares to others, I can only tell you what it did for me on my 04 Boxster S. I made my own cold air system, Pedro's planum,cheap ebay headers, made the intermediate "test pipes" and bought a used Borla Muffler and gained over 40 hp. I know this cause I dynoed it. I got 264 at the rear wheels compared to 218 stock whick equates to about 310 flywheel hp torque is around 230+ . So yeah, i'm happy with softronics tune also took away throttle lag, it gets up and goes when you touch the pedal.
Down side? I can only think of possibly one thing, the throttle response is so rapid that if you start out slow (sometimes) it bucks a little, but if you stomp on it, it goes away. I can live with that.
good luck deciding

HRC